Commit message: https://github.com/ImageMagick/ImageMagick/issues/1221
CVE: CVE-2018-14551
CWE: CWE-787
Vulnerability description: The ReadMATImageV4 function in coders/mat.c in ImageMagick 7.0.8-7 uses an uninitialized variable, leading to memory corruption.

Project: ImageMagick
File: mat.c

static MagickBooleanType WriteMATImage(const ImageInfo *image_info,Image *image,
  ExceptionInfo *exception)
{
  char
    MATLAB_HDR[0x80];

  MagickBooleanType
    status;

  MagickOffsetType
    scene;

  size_t
    imageListLength;

  struct tm
    local_time;

  time_t
    current_time;

  /*
    Open output image file.
  */
  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickCoreSignature);
  assert(image != (Image *) NULL);
  assert(image->signature == MagickCoreSignature);
  (void) LogMagickEvent(CoderEvent,GetMagickModule(),"enter MAT");
  assert(exception != (ExceptionInfo *) NULL);
  assert(exception->signature == MagickCoreSignature);
  status=OpenBlob(image_info,image,WriteBinaryBlobMode,exception);
  if (status == MagickFalse)
    return(MagickFalse);
  image->depth=8;

  current_time=time((time_t *) NULL);
#if defined(MAGICKCORE_HAVE_LOCALTIME_R)
  (void) localtime_r(&current_time,&local_time);
#else
  (void) memcpy(&local_time,localtime(&current_time),sizeof(local_time));
#endif
  (void) memset(MATLAB_HDR,' ',MagickMin(sizeof(MATLAB_HDR),124));
  FormatLocaleString(MATLAB_HDR,sizeof(MATLAB_HDR),
    "MATLAB 5.0 MAT-file, Platform: %s, Created on: %s %s %2d %2d:%2d:%2d %d",
    OsDesc,DayOfWTab[local_time.tm_wday],MonthsTab[local_time.tm_mon],
    local_time.tm_mday,local_time.tm_hour,local_time.tm_min,
    local_time.tm_sec,local_time.tm_year+1900);
  MATLAB_HDR[0x7C]=0;
  MATLAB_HDR[0x7D]=1;
  MATLAB_HDR[0x7E]='I';
  MATLAB_HDR[0x7F]='M';
  (void) WriteBlob(image,sizeof(MATLAB_HDR),(unsigned char *) MATLAB_HDR);
  scene=0;
  imageListLength=GetImageListLength(image);
  do
  {
    char
      padding;

    MagickBooleanType
      is_gray;

    QuantumInfo
      *quantum_info;

    size_t
      data_size;

    unsigned char
      *pixels;

    unsigned int
      z;

    (void) TransformImageColorspace(image,sRGBColorspace,exception);
    is_gray=SetImageGray(image,exception);
    z=(is_gray != MagickFalse) ? 0 : 3;

    /*
      Store MAT header.
    */
    data_size = image->rows * image->columns;
    if (is_gray == MagickFalse)
      data_size*=3;
    padding=((unsigned char)(data_size-1) & 0x7) ^ 0x7;

    (void) WriteBlobLSBLong(image,miMATRIX);
    (void) WriteBlobLSBLong(image,(unsigned int) data_size+padding+
      ((is_gray != MagickFalse) ? 48 : 56));
    (void) WriteBlobLSBLong(image,0x6); /* 0x88 */
    (void) WriteBlobLSBLong(image,0x8); /* 0x8C */
    (void) WriteBlobLSBLong(image,0x6); /* 0x90 */
    (void) WriteBlobLSBLong(image,0);
    (void) WriteBlobLSBLong(image,0x5); /* 0x98 */
    (void) WriteBlobLSBLong(image,(is_gray != MagickFalse) ? 0x8 : 0xC); /* 0x9C - DimFlag */
    (void) WriteBlobLSBLong(image,(unsigned int) image->rows);    /* x: 0xA0 */
    (void) WriteBlobLSBLong(image,(unsigned int) image->columns); /* y: 0xA4 */
    if (is_gray == MagickFalse)
      {
        (void) WriteBlobLSBLong(image,3); /* z: 0xA8 */
        (void) WriteBlobLSBLong(image,0);
      }
    (void) WriteBlobLSBShort(image,1);  /* 0xB0 */
    (void) WriteBlobLSBShort(image,1);  /* 0xB2 */
    (void) WriteBlobLSBLong(image,'M'); /* 0xB4 */
    (void) WriteBlobLSBLong(image,0x2); /* 0xB8 */
    (void) WriteBlobLSBLong(image,(unsigned int) data_size); /* 0xBC */

    /*
      Store image data.
    */
    quantum_info=AcquireQuantumInfo(image_info,image);
    if (quantum_info == (QuantumInfo *) NULL)
      ThrowWriterException(ResourceLimitError,"MemoryAllocationFailed");
    pixels=(unsigned char *) GetQuantumPixels(quantum_info);
    do
    {
      const Quantum
        *p;

      ssize_t
        y;

      for (y=0; y < (ssize_t)image->columns; y++)
      {
        p=GetVirtualPixels(image,y,0,1,image->rows,exception);
        if (p == (const Quantum *) NULL)
          break;
        (void) ExportQuantumPixels(image,(CacheView *) NULL,quantum_info,
          z2qtype[z],pixels,exception);
        (void) WriteBlob(image,image->rows,pixels);
      }
      if (SyncAuthenticPixels(image,exception) == MagickFalse)
        break;
    } while (z-- >= 2);
    while (padding-- > 0)
      (void) WriteBlobByte(image,0);
    quantum_info=DestroyQuantumInfo(quantum_info);
    if (GetNextImageInList(image) == (Image *) NULL)
      break;
    image=SyncNextImageInList(image);
    status=SetImageProgress(image,SaveImagesTag,scene++,imageListLength);
    if (status == MagickFalse)
      break;
  } while (image_info->adjoin != MagickFalse);
  (void) CloseBlob(image);
  return(status);
}

Project: ImageMagick
File: mat.c

static Image *ReadMATImageV4(const ImageInfo *image_info,Image *image,
  ExceptionInfo *exception)
{
  typedef struct {
    unsigned char Type[4];
    unsigned int nRows;
    unsigned int nCols;
    unsigned int imagf;
    unsigned int nameLen;
  } MAT4_HDR;

  long
    ldblk;

  EndianType
    endian;

  Image
    *rotated_image;

  MagickBooleanType
    status;

  MAT4_HDR
    HDR;

  QuantumInfo
    *quantum_info;

  QuantumFormatType
    format_type;

  register ssize_t
    i;

  ssize_t
    count,
    y;

  unsigned char
    *pixels;

  unsigned int
    depth;

  quantum_info=(QuantumInfo *) NULL;
  (void) SeekBlob(image,0,SEEK_SET);
  status=MagickTrue;
  while (EOFBlob(image) == MagickFalse)
  {
    /*
     Object parser loop.
    */
    ldblk=ReadBlobLSBLong(image);
    if ((ldblk > 9999) || (ldblk < 0))
      break;
    HDR.Type[3]=ldblk % 10; ldblk /= 10;  /* T digit */
    HDR.Type[2]=ldblk % 10; ldblk /= 10;  /* P digit */
    HDR.Type[1]=ldblk % 10; ldblk /= 10;  /* O digit */
    HDR.Type[0]=ldblk;        /* M digit */
    if (HDR.Type[3] != 0)
      break;  /* Data format */
    if (HDR.Type[2] != 0)
      break;  /* Always 0 */
    if (HDR.Type[0] == 0)
      {
        HDR.nRows=ReadBlobLSBLong(image);
        HDR.nCols=ReadBlobLSBLong(image);
        HDR.imagf=ReadBlobLSBLong(image);
        HDR.nameLen=ReadBlobLSBLong(image);
        endian=LSBEndian;
      }
    else
      {
        HDR.nRows=ReadBlobMSBLong(image);
        HDR.nCols=ReadBlobMSBLong(image);
        HDR.imagf=ReadBlobMSBLong(image);
        HDR.nameLen=ReadBlobMSBLong(image);
        endian=MSBEndian;
      }
    if ((HDR.imagf != 0) && (HDR.imagf != 1))
      break;
    if (HDR.nameLen > 0xFFFF)
      return(DestroyImageList(image));
    for (i=0; i < (ssize_t) HDR.nameLen; i++)
    {
      int
        byte;

      /*
        Skip matrix name.
      */
      byte=ReadBlobByte(image);
      if (byte == EOF)
        {
          ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
            image->filename);
          break;
        }
    }
    image->columns=(size_t) HDR.nRows;
    image->rows=(size_t) HDR.nCols;
    if ((image->columns == 0) || (image->rows == 0))
      return(DestroyImageList(image));
    if (image_info->ping != MagickFalse)
      {
        Swap(image->columns,image->rows);
        if(HDR.imagf==1) ldblk *= 2;
        SeekBlob(image, HDR.nCols*ldblk, SEEK_CUR);
        if ((image->columns == 0) || (image->rows == 0))
          return(image->previous == (Image *) NULL ? DestroyImageList(image)
            : image);
        goto skip_reading_current;
      }
    status=SetImageExtent(image,image->columns,image->rows,exception);
    if (status == MagickFalse)
      return(DestroyImageList(image));
    (void) SetImageBackgroundColor(image,exception);
    (void) SetImageColorspace(image,GRAYColorspace,exception);
    quantum_info=AcquireQuantumInfo(image_info,image);
    if (quantum_info == (QuantumInfo *) NULL)
      return(DestroyImageList(image));
    switch(HDR.Type[1])
    {
      case 0:
        format_type=FloatingPointQuantumFormat;
        depth=64;
        break;
      case 1:
        format_type=FloatingPointQuantumFormat;
        depth=32;
        break;
      case 2:
        format_type=UnsignedQuantumFormat;
        depth=16;
        break;
      case 3:
        format_type=SignedQuantumFormat;
        depth=16;
        break;
      case 4:
        format_type=UnsignedQuantumFormat;
        depth=8;
        break;
      default:
        format_type=UnsignedQuantumFormat;
        depth=8;
        break;
    }
    image->depth=depth;
    if (HDR.Type[0] != 0)
      SetQuantumEndian(image,quantum_info,MSBEndian);
    status=SetQuantumFormat(image,quantum_info,format_type);
    status=SetQuantumDepth(image,quantum_info,depth);
    status=SetQuantumEndian(image,quantum_info,endian);
    SetQuantumScale(quantum_info,1.0);
    pixels=(unsigned char *) GetQuantumPixels(quantum_info);
    for (y=0; y < (ssize_t) image->rows; y++)
    {
      register Quantum
        *magick_restrict q;

      count=ReadBlob(image,depth/8*image->columns,(char *) pixels);
      if (count == -1)
        break;
      q=QueueAuthenticPixels(image,0,image->rows-y-1,image->columns,1,
        exception);
      if (q == (Quantum *) NULL)
        break;
      (void) ImportQuantumPixels(image,(CacheView *) NULL,quantum_info,
        GrayQuantum,pixels,exception);
      if ((HDR.Type[1] == 2) || (HDR.Type[1] == 3))
        FixSignedValues(image,q,(int) image->columns);
      if (SyncAuthenticPixels(image,exception) == MagickFalse)
        break;
      if (image->previous == (Image *) NULL)
        {
          status=SetImageProgress(image,LoadImageTag,(MagickOffsetType) y,
            image->rows);
          if (status == MagickFalse)
            break;
        }
    }
    if (HDR.imagf == 1)
      for (y=0; y < (ssize_t) image->rows; y++)
      {
        /*
          Read complex pixels.
        */
        count=ReadBlob(image,depth/8*image->columns,(char *) pixels);
        if (count == -1)
          break;
        if (HDR.Type[1] == 0)
          InsertComplexDoubleRow(image,(double *) pixels,y,0,0,exception);
        else
          InsertComplexFloatRow(image,(float *) pixels,y,0,0,exception);
      }
    if (quantum_info != (QuantumInfo *) NULL)
      quantum_info=DestroyQuantumInfo(quantum_info);
    if (EOFBlob(image) != MagickFalse)
      {
        ThrowFileException(exception,CorruptImageError,"UnexpectedEndOfFile",
          image->filename);
        break;
      }
    rotated_image=RotateImage(image,90.0,exception);
    if (rotated_image != (Image *) NULL)
      {
        rotated_image->page.x=0;
        rotated_image->page.y=0;
        rotated_image->colors = image->colors;
        DestroyBlob(rotated_image);
        rotated_image->blob=ReferenceBlob(image->blob);
        AppendImageToList(&image,rotated_image);
        DeleteImageFromList(&image);
      }
    /*
      Proceed to next image.
    */
    if (image_info->number_scenes != 0)
      if (image->scene >= (image_info->scene+image_info->number_scenes-1))
        break;
    /*
      Allocate next image structure.
    */
skip_reading_current:
    AcquireNextImage(image_info,image,exception);
    if (GetNextImageInList(image) == (Image *) NULL)
      {
        status=MagickFalse;
        break;
      }
    image=SyncNextImageInList(image);
    status=SetImageProgress(image,LoadImagesTag,TellBlob(image),
      GetBlobSize(image));
    if (status == MagickFalse)
      break;
  }
  (void) CloseBlob(image);
  if (status == MagickFalse)
    return(DestroyImageList(image));
  return(GetFirstImageInList(image));
}

Project: ImageMagick
File: mat.c

static void InsertComplexDoubleRow(Image *image,double *p,int y,double MinVal,
  double MaxVal,ExceptionInfo *exception)
{

  double f;
  int x;
  register Quantum *q;

  if (MinVal == 0)
    MinVal = -1;
  if (MaxVal == 0)
    MaxVal = 1;

  q=QueueAuthenticPixels(image,0,y,image->columns,1,exception);
  if (q == (Quantum *) NULL)
    return;
  for (x = 0; x < (ssize_t) image->columns; x++)
  {
    if (*p > 0)
    {
      f = (*p / MaxVal) * (QuantumRange-GetPixelRed(image,q));
      if (f + GetPixelRed(image,q) > QuantumRange)
        SetPixelRed(image,QuantumRange,q);
      else
        SetPixelRed(image,GetPixelRed(image,q)+(int) f,q);
      if ((int) f / 2.0 > GetPixelGreen(image,q))
        {
          SetPixelGreen(image,0,q);
          SetPixelBlue(image,0,q);
        }
      else
        {
          SetPixelBlue(image,GetPixelBlue(image,q)-(int) (f/2.0),q);
          SetPixelGreen(image,GetPixelBlue(image,q),q);
        }
    }
    if (*p < 0)
    {
      f = (*p / MinVal) * (QuantumRange-GetPixelBlue(image,q));
      if (f+GetPixelBlue(image,q) > QuantumRange)
        SetPixelBlue(image,QuantumRange,q);
      else
        SetPixelBlue(image,GetPixelBlue(image,q)+(int) f,q);
      if ((int) f / 2.0 > GetPixelGreen(image,q))
        {
          SetPixelRed(image,0,q);
          SetPixelGreen(image,0,q);
        }
      else
        {
          SetPixelRed(image,GetPixelRed(image,q)-(int) (f/2.0),q);
          SetPixelGreen(image,GetPixelRed(image,q),q);
        }
    }
    p++;
    q+=GetPixelChannels(image);
  }
  if (!SyncAuthenticPixels(image,exception))
    return;
  return;
}

Project: ImageMagick
File: mat.c

static Image *ReadMATImage(const ImageInfo *image_info,ExceptionInfo *exception)
{
  Image *image, *image2=NULL,
   *rotated_image;
  register Quantum *q;

  unsigned int status;
  MATHeader MATLAB_HDR;
  size_t size;
  size_t CellType;
  QuantumInfo *quantum_info;
  ImageInfo *clone_info;
  int i;
  ssize_t ldblk;
  unsigned char *BImgBuff = NULL;
  double MinVal, MaxVal;
  unsigned z, z2;
  unsigned Frames;
  int logging;
  int sample_size;
  MagickOffsetType filepos=0x80;

  unsigned int (*ReadBlobXXXLong)(Image *image);
  unsigned short (*ReadBlobXXXShort)(Image *image);
  void (*ReadBlobDoublesXXX)(Image * image, size_t len, double *data);
  void (*ReadBlobFloatsXXX)(Image * image, size_t len, float *data);


  assert(image_info != (const ImageInfo *) NULL);
  assert(image_info->signature == MagickCoreSignature);
  assert(exception != (ExceptionInfo *) NULL);
  assert(exception->signature == MagickCoreSignature);
  logging = LogMagickEvent(CoderEvent,GetMagickModule(),"enter");

  /*
     Open image file.
   */
  image = AcquireImage(image_info,exception);
  image2 = (Image *) NULL;

  status = OpenBlob(image_info, image, ReadBinaryBlobMode, exception);
  if (status == MagickFalse)
    {
      image=DestroyImageList(image);
      return((Image *) NULL);
    }
  /*
     Read MATLAB image.
   */
  quantum_info=(QuantumInfo *) NULL;
  clone_info=(ImageInfo *) NULL;
  if (ReadBlob(image,124,(unsigned char *) &MATLAB_HDR.identific) != 124)
    ThrowReaderException(CorruptImageError,"ImproperImageHeader");
  if (strncmp(MATLAB_HDR.identific,"MATLAB",6) != 0)
    {
      image=ReadMATImageV4(image_info,image,exception);
      if (image == NULL)
        {
          if ((image != image2) && (image2 != (Image *) NULL))
            image2=DestroyImage(image2);
          if (clone_info != (ImageInfo *) NULL)
            clone_info=DestroyImageInfo(clone_info);
          return((Image *) NULL);
        }
      goto END_OF_READING;
    }
  MATLAB_HDR.Version = ReadBlobLSBShort(image);
  if(ReadBlob(image,2,(unsigned char *) &MATLAB_HDR.EndianIndicator) != 2)
    ThrowReaderException(CorruptImageError,"ImproperImageHeader");

  if (logging)
    (void) LogMagickEvent(CoderEvent,GetMagickModule(),"  Endian %c%c",
      MATLAB_HDR.EndianIndicator[0],MATLAB_HDR.EndianIndicator[1]);
  if (!strncmp(MATLAB_HDR.EndianIndicator, "IM", 2))
  {
    ReadBlobXXXLong = ReadBlobLSBLong;
    ReadBlobXXXShort = ReadBlobLSBShort;
    ReadBlobDoublesXXX = ReadBlobDoublesLSB;
    ReadBlobFloatsXXX = ReadBlobFloatsLSB;
    image->endian = LSBEndian;
  }
  else if (!strncmp(MATLAB_HDR.EndianIndicator, "MI", 2))
  {
    ReadBlobXXXLong = ReadBlobMSBLong;
    ReadBlobXXXShort = ReadBlobMSBShort;
    ReadBlobDoublesXXX = ReadBlobDoublesMSB;
    ReadBlobFloatsXXX = ReadBlobFloatsMSB;
    image->endian = MSBEndian;
  }
  else
    {
MATLAB_KO:
      if ((image != image2) && (image2 != (Image *) NULL))
        image2=DestroyImage(image2);
      if (clone_info != (ImageInfo *) NULL)
        clone_info=DestroyImageInfo(clone_info);
      ThrowReaderException(CorruptImageError,"ImproperImageHeader");
    }

  filepos = TellBlob(image);
  while(!EOFBlob(image)) /* object parser loop */
  {
    Frames = 1;
    if (filepos != (unsigned int) filepos)
      break;
    if(SeekBlob(image,filepos,SEEK_SET) != filepos) break;
    /* printf("pos=%X\n",TellBlob(image)); */

    MATLAB_HDR.DataType = ReadBlobXXXLong(image);
    if(EOFBlob(image)) break;
    MATLAB_HDR.ObjectSize = ReadBlobXXXLong(image);
    if(EOFBlob(image)) break;
    if((MagickSizeType) (MATLAB_HDR.ObjectSize+filepos) > GetBlobSize(image))
      goto MATLAB_KO;
    filepos += (MagickOffsetType) MATLAB_HDR.ObjectSize + 4 + 4;

    if (clone_info != (ImageInfo *) NULL)
      clone_info=DestroyImageInfo(clone_info);
    clone_info=CloneImageInfo(image_info);
    if ((image != image2) && (image2 != (Image *) NULL))
      image2=DestroyImage(image2);
    image2 = image;
#if defined(MAGICKCORE_ZLIB_DELEGATE)
    if(MATLAB_HDR.DataType == miCOMPRESSED)
    {
      image2 = decompress_block(image,&MATLAB_HDR.ObjectSize,clone_info,exception);
      if(image2==NULL) continue;
      MATLAB_HDR.DataType = ReadBlobXXXLong(image2); /* replace compressed object type. */
    }
#endif

    if (MATLAB_HDR.DataType != miMATRIX)
      {
        clone_info=DestroyImageInfo(clone_info);
#if defined(MAGICKCORE_ZLIB_DELEGATE)
        if (image2 != image)
          DeleteImageFromList(&image2);
#endif
        continue;  /* skip another objects. */
      }

    MATLAB_HDR.unknown1 = ReadBlobXXXLong(image2);
    MATLAB_HDR.unknown2 = ReadBlobXXXLong(image2);

    MATLAB_HDR.unknown5 = ReadBlobXXXLong(image2);
    MATLAB_HDR.StructureClass = MATLAB_HDR.unknown5 & 0xFF;
    MATLAB_HDR.StructureFlag = (MATLAB_HDR.unknown5>>8) & 0xFF;

    MATLAB_HDR.unknown3 = ReadBlobXXXLong(image2);
    if(image!=image2)
      MATLAB_HDR.unknown4 = ReadBlobXXXLong(image2);  /* ??? don't understand why ?? */
    MATLAB_HDR.unknown4 = ReadBlobXXXLong(image2);
    MATLAB_HDR.DimFlag = ReadBlobXXXLong(image2);
    MATLAB_HDR.SizeX = ReadBlobXXXLong(image2);
    MATLAB_HDR.SizeY = ReadBlobXXXLong(image2);


    switch(MATLAB_HDR.DimFlag)
    {
      case  8: z2=z=1; break;      /* 2D matrix*/
      case 12: z2=z = ReadBlobXXXLong(image2);  /* 3D matrix RGB*/
           (void) ReadBlobXXXLong(image2);
         if(z!=3)
           {
             if (clone_info != (ImageInfo *) NULL)
               clone_info=DestroyImageInfo(clone_info);
             if ((image != image2) && (image2 != (Image *) NULL))
               image2=DestroyImage(image2);
             ThrowReaderException(CoderError,
               "MultidimensionalMatricesAreNotSupported");
           }
         break;
      case 16: z2=z = ReadBlobXXXLong(image2);  /* 4D matrix animation */
         if(z!=3 && z!=1)
           {
             if (clone_info != (ImageInfo *) NULL)
               clone_info=DestroyImageInfo(clone_info);
             if ((image != image2) && (image2 != (Image *) NULL))
               image2=DestroyImage(image2);
             ThrowReaderException(CoderError,
               "MultidimensionalMatricesAreNotSupported");
           }
          Frames = ReadBlobXXXLong(image2);
          if (Frames == 0)
            {
              if (clone_info != (ImageInfo *) NULL)
                clone_info=DestroyImageInfo(clone_info);
              if ((image != image2) && (image2 != (Image *) NULL))
                image2=DestroyImage(image2);
              ThrowReaderException(CorruptImageError,"ImproperImageHeader");
            }
          if (AcquireMagickResource(ListLengthResource,Frames) == MagickFalse)
            {
              if (clone_info != (ImageInfo *) NULL)
                clone_info=DestroyImageInfo(clone_info);
              if ((image != image2) && (image2 != (Image *) NULL))
                image2=DestroyImage(image2);
              ThrowReaderException(ResourceLimitError,"ListLengthExceedsLimit");
            }
         break;
      default:
        if (clone_info != (ImageInfo *) NULL)
          clone_info=DestroyImageInfo(clone_info);
        if ((image != image2) && (image2 != (Image *) NULL))
          image2=DestroyImage(image2);
        ThrowReaderException(CoderError, "MultidimensionalMatricesAreNotSupported");
    }

    MATLAB_HDR.Flag1 = ReadBlobXXXShort(image2);
    MATLAB_HDR.NameFlag = ReadBlobXXXShort(image2);

    if (logging) (void)LogMagickEvent(CoderEvent,GetMagickModule(),
          "MATLAB_HDR.StructureClass %d",MATLAB_HDR.StructureClass);
    if (MATLAB_HDR.StructureClass != mxCHAR_CLASS &&
        MATLAB_HDR.StructureClass != mxSINGLE_CLASS &&    /* float + complex float */
        MATLAB_HDR.StructureClass != mxDOUBLE_CLASS &&    /* double + complex double */
        MATLAB_HDR.StructureClass != mxINT8_CLASS &&
        MATLAB_HDR.StructureClass != mxUINT8_CLASS &&    /* uint8 + uint8 3D */
        MATLAB_HDR.StructureClass != mxINT16_CLASS &&
        MATLAB_HDR.StructureClass != mxUINT16_CLASS &&    /* uint16 + uint16 3D */
        MATLAB_HDR.StructureClass != mxINT32_CLASS &&
        MATLAB_HDR.StructureClass != mxUINT32_CLASS &&    /* uint32 + uint32 3D */
        MATLAB_HDR.StructureClass != mxINT64_CLASS &&
        MATLAB_HDR.StructureClass != mxUINT64_CLASS)    /* uint64 + uint64 3D */
      {
        if ((image2 != (Image*) NULL) && (image2 != image))
          {
            CloseBlob(image2);
            DeleteImageFromList(&image2);
          }
        if (clone_info != (ImageInfo *) NULL)
          clone_info=DestroyImageInfo(clone_info);
        ThrowReaderException(CoderError,"UnsupportedCellTypeInTheMatrix");
      }

    switch (MATLAB_HDR.NameFlag)
    {
      case 0:
        size = ReadBlobXXXLong(image2);  /* Object name string size */
        size = 4 * (((size_t) size + 3 + 1) / 4);
        (void) SeekBlob(image2, size, SEEK_CUR);
        break;
      case 1:
      case 2:
      case 3:
      case 4:
        (void) ReadBlob(image2, 4, (unsigned char *) &size); /* Object name string */
        break;
      default:
        goto MATLAB_KO;
    }

    CellType = ReadBlobXXXLong(image2);    /* Additional object type */
    if (logging)
      (void) LogMagickEvent(CoderEvent,GetMagickModule(),
        "MATLAB_HDR.CellType: %.20g",(double) CellType);

    (void) ReadBlob(image2, 4, (unsigned char *) &size);     /* data size */

    NEXT_FRAME:
    switch (CellType)
    {
      case miINT8:
      case miUINT8:
        sample_size = 8;
        if(MATLAB_HDR.StructureFlag & FLAG_LOGICAL)
          image->depth = 1;
        else
          image->depth = 8;         /* Byte type cell */
        ldblk = (ssize_t) MATLAB_HDR.SizeX;
        break;
      case miINT16:
      case miUINT16:
        sample_size = 16;
        image->depth = 16;        /* Word type cell */
        ldblk = (ssize_t) (2 * MATLAB_HDR.SizeX);
        break;
      case miINT32:
      case miUINT32:
        sample_size = 32;
        image->depth = 32;        /* Dword type cell */
        ldblk = (ssize_t) (4 * MATLAB_HDR.SizeX);
        break;
      case miINT64:
      case miUINT64:
        sample_size = 64;
        image->depth = 64;        /* Qword type cell */
        ldblk = (ssize_t) (8 * MATLAB_HDR.SizeX);
        break;
      case miSINGLE:
        sample_size = 32;
        image->depth = 32;        /* double type cell */
        (void) SetImageOption(clone_info,"quantum:format","floating-point");
        if (MATLAB_HDR.StructureFlag & FLAG_COMPLEX)
          {              /* complex float type cell */
          }
        ldblk = (ssize_t) (4 * MATLAB_HDR.SizeX);
        break;
      case miDOUBLE:
        sample_size = 64;
        image->depth = 64;        /* double type cell */
        (void) SetImageOption(clone_info,"quantum:format","floating-point");
DisableMSCWarning(4127)
        if (sizeof(double) != 8)
RestoreMSCWarning
          {
            if (clone_info != (ImageInfo *) NULL)
              clone_info=DestroyImageInfo(clone_info);
            if ((image != image2) && (image2 != (Image *) NULL))
              image2=DestroyImage(image2);
            ThrowReaderException(CoderError, "IncompatibleSizeOfDouble");
          }
        if (MATLAB_HDR.StructureFlag & FLAG_COMPLEX)
          {                         /* complex double type cell */
          }
        ldblk = (ssize_t) (8 * MATLAB_HDR.SizeX);
        break;
      default:
        if ((image != image2) && (image2 != (Image *) NULL))
          image2=DestroyImage(image2);
        if (clone_info)
          clone_info=DestroyImageInfo(clone_info);
        ThrowReaderException(CoderError, "UnsupportedCellTypeInTheMatrix");
    }
    (void) sample_size;
    image->columns = MATLAB_HDR.SizeX;
    image->rows = MATLAB_HDR.SizeY;
    image->colors = GetQuantumRange(image->depth);
    if (image->columns == 0 || image->rows == 0)
      goto MATLAB_KO;
    if((unsigned int)ldblk*MATLAB_HDR.SizeY > MATLAB_HDR.ObjectSize)
      goto MATLAB_KO;
    /* Image is gray when no complex flag is set and 2D Matrix */
    if ((MATLAB_HDR.DimFlag == 8) &&
        ((MATLAB_HDR.StructureFlag & FLAG_COMPLEX) == 0))
      {
        image->type=GrayscaleType;
        SetImageColorspace(image,GRAYColorspace,exception);
      }


    /*
      If ping is true, then only set image size and colors without
      reading any image data.
    */
    if (image_info->ping)
    {
      size_t temp = image->columns;
      image->columns = image->rows;
      image->rows = temp;
      goto done_reading; /* !!!!!! BAD  !!!! */
    }
    status=SetImageExtent(image,image->columns,image->rows,exception);
    if (status == MagickFalse)
      {
        if (clone_info != (ImageInfo *) NULL)
          clone_info=DestroyImageInfo(clone_info);
        if ((image != image2) && (image2 != (Image *) NULL))
          image2=DestroyImage(image2);
        return(DestroyImageList(image));
      }
    (void) SetImageBackgroundColor(image,exception);
    quantum_info=AcquireQuantumInfo(clone_info,image);
    if (quantum_info == (QuantumInfo *) NULL)
      {
        if (clone_info != (ImageInfo *) NULL)
          clone_info=DestroyImageInfo(clone_info);
        if ((image != image2) && (image2 != (Image *) NULL))
          image2=DestroyImage(image2);
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      }

  /* ----- Load raster data ----- */
    BImgBuff = (unsigned char *) AcquireQuantumMemory((size_t) (ldblk),sizeof(double));    /* Ldblk was set in the check phase */
    if (BImgBuff == NULL)
      {
        if (clone_info != (ImageInfo *) NULL)
          clone_info=DestroyImageInfo(clone_info);
        if ((image != image2) && (image2 != (Image *) NULL))
          image2=DestroyImage(image2);
        if (quantum_info != (QuantumInfo *) NULL)
          quantum_info=DestroyQuantumInfo(quantum_info);
        ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
      }
    (void) memset(BImgBuff,0,ldblk*sizeof(double));

    MinVal = 0;
    MaxVal = 0;
    if (CellType==miDOUBLE || CellType==miSINGLE)        /* Find Min and Max Values for floats */
      {
        CalcMinMax(image2,image_info->endian,MATLAB_HDR.SizeX,MATLAB_HDR.SizeY,
          CellType,ldblk,BImgBuff,&quantum_info->minimum,
          &quantum_info->maximum);
      }

    /* Main loop for reading all scanlines */
    if(z==1) z=0; /* read grey scanlines */
    /* else read color scanlines */
    do
    {
      for (i = 0; i < (ssize_t) MATLAB_HDR.SizeY; i++)
      {
        q=GetAuthenticPixels(image,0,MATLAB_HDR.SizeY-i-1,image->columns,1,exception);
        if (q == (Quantum *) NULL)
          {
            if (logging) (void)LogMagickEvent(CoderEvent,GetMagickModule(),
              "  MAT set image pixels returns unexpected NULL on a row %u.", (unsigned)(MATLAB_HDR.SizeY-i-1));
            goto done_reading;    /* Skip image rotation, when cannot set image pixels    */
          }
        if(ReadBlob(image2,ldblk,(unsigned char *)BImgBuff) != (ssize_t) ldblk)
          {
            if (logging) (void)LogMagickEvent(CoderEvent,GetMagickModule(),
              "  MAT cannot read scanrow %u from a file.", (unsigned)(MATLAB_HDR.SizeY-i-1));
            goto ExitLoop;
          }
        if((CellType==miINT8 || CellType==miUINT8) && (MATLAB_HDR.StructureFlag & FLAG_LOGICAL))
        {
          FixLogical((unsigned char *)BImgBuff,ldblk);
          if(ImportQuantumPixels(image,(CacheView *) NULL,quantum_info,z2qtype[z],BImgBuff,exception) <= 0)
            {
ImportQuantumPixelsFailed:
              if (logging) (void)LogMagickEvent(CoderEvent,GetMagickModule(),
                "  MAT failed to ImportQuantumPixels for a row %u", (unsigned)(MATLAB_HDR.SizeY-i-1));
              break;
            }
        }
        else
        {
          if(ImportQuantumPixels(image,(CacheView *) NULL,quantum_info,z2qtype[z],BImgBuff,exception) <= 0)
            goto ImportQuantumPixelsFailed;


          if (z<=1 &&       /* fix only during a last pass z==0 || z==1 */
             (CellType==miINT8 || CellType==miINT16 || CellType==miINT32 || CellType==miINT64))
            FixSignedValues(image,q,MATLAB_HDR.SizeX);
        }

        if (!SyncAuthenticPixels(image,exception))
          {
            if (logging) (void)LogMagickEvent(CoderEvent,GetMagickModule(),
              "  MAT failed to sync image pixels for a row %u", (unsigned)(MATLAB_HDR.SizeY-i-1));
            goto ExitLoop;
          }
      }
    } while(z-- >= 2);
ExitLoop:


    /* Read complex part of numbers here */
    if (MATLAB_HDR.StructureFlag & FLAG_COMPLEX)
    {        /* Find Min and Max Values for complex parts of floats */
      CellType = ReadBlobXXXLong(image2);    /* Additional object type */
      i = ReadBlobXXXLong(image2);           /* size of a complex part - toss away*/

      if (CellType==miDOUBLE || CellType==miSINGLE)
      {
        CalcMinMax(image2,  image_info->endian, MATLAB_HDR.SizeX, MATLAB_HDR.SizeY, CellType, ldblk, BImgBuff, &MinVal, &MaxVal);
      }

      if (CellType==miDOUBLE)
        for (i = 0; i < (ssize_t) MATLAB_HDR.SizeY; i++)
        {
          ReadBlobDoublesXXX(image2, ldblk, (double *)BImgBuff);
          InsertComplexDoubleRow(image, (double *)BImgBuff, i, MinVal, MaxVal,
            exception);
        }

      if (CellType==miSINGLE)
        for (i = 0; i < (ssize_t) MATLAB_HDR.SizeY; i++)
        {
          ReadBlobFloatsXXX(image2, ldblk, (float *)BImgBuff);
          InsertComplexFloatRow(image,(float *)BImgBuff,i,MinVal,MaxVal,
            exception);
        }
    }

      /* Image is gray when no complex flag is set and 2D Matrix AGAIN!!! */
    if ((MATLAB_HDR.DimFlag == 8) &&
        ((MATLAB_HDR.StructureFlag & FLAG_COMPLEX) == 0))
      image->type=GrayscaleType;
    if (image->depth == 1)
      image->type=BilevelType;

    if(image2==image)
        image2 = NULL;    /* Remove shadow copy to an image before rotation. */

      /*  Rotate image. */
    rotated_image = RotateImage(image, 90.0, exception);
    if (rotated_image != (Image *) NULL)
    {
        /* Remove page offsets added by RotateImage */
      rotated_image->page.x=0;
      rotated_image->page.y=0;
      rotated_image->colors = image->colors;
      DestroyBlob(rotated_image);
      rotated_image->blob=ReferenceBlob(image->blob);
      AppendImageToList(&image,rotated_image);
      DeleteImageFromList(&image);
    }

done_reading:

    if(image2!=NULL)
      if(image2!=image)
      {
        DeleteImageFromList(&image2);
        if(clone_info)
        {
          if(clone_info->file)
          {
            fclose(clone_info->file);
            clone_info->file = NULL;
            (void) remove_utf8(clone_info->filename);
          }
        }
      }
    if (EOFBlob(image) != MagickFalse)
      break;

      /* Allocate next image structure. */
    AcquireNextImage(image_info,image,exception);
    if (image->next == (Image *) NULL) break;
    image=SyncNextImageInList(image);
    image->columns=image->rows=0;
    image->colors=0;

      /* row scan buffer is no longer needed */
    RelinquishMagickMemory(BImgBuff);
    BImgBuff = NULL;
    if (quantum_info != (QuantumInfo *) NULL)
      quantum_info=DestroyQuantumInfo(quantum_info);

    if(--Frames>0)
    {
      z = z2;
      if(image2==NULL) image2 = image;
      if(!EOFBlob(image) && TellBlob(image)<filepos)
        goto NEXT_FRAME;
    }
    if ((image2!=NULL) && (image2!=image))   /* Does shadow temporary decompressed image exist? */
      {
/*  CloseBlob(image2); */
        DeleteImageFromList(&image2);
        if(clone_info)
        {
          if(clone_info->file)
          {
            fclose(clone_info->file);
            clone_info->file = NULL;
            (void) remove_utf8(clone_info->filename);
          }
        }
      }

    if (clone_info)
      clone_info=DestroyImageInfo(clone_info);
  }

  RelinquishMagickMemory(BImgBuff);
  if (quantum_info != (QuantumInfo *) NULL)
    quantum_info=DestroyQuantumInfo(quantum_info);
END_OF_READING:
  CloseBlob(image);


  {
    Image *p;
    ssize_t scene=0;

    /*
      Rewind list, removing any empty images while rewinding.
    */
    p=image;
    image=NULL;
    while (p != (Image *) NULL)
      {
        Image *tmp=p;
        if ((p->rows == 0) || (p->columns == 0)) {
          p=p->previous;
          if (tmp == image2)
            image2=(Image *) NULL;
          DeleteImageFromList(&tmp);
        } else {
          image=p;
          p=p->previous;
        }
      }

    /*
      Fix scene numbers
    */
    for (p=image; p != (Image *) NULL; p=p->next)
      p->scene=scene++;
  }

  if(clone_info != NULL)  /* cleanup garbage file from compression */
  {
    if(clone_info->file)
    {
      fclose(clone_info->file);
      clone_info->file = NULL;
      (void) remove_utf8(clone_info->filename);
    }
    DestroyImageInfo(clone_info);
    clone_info = NULL;
  }
  if (logging) (void)LogMagickEvent(CoderEvent,GetMagickModule(),"return");
  if ((image != image2) && (image2 != (Image *) NULL))
    image2=DestroyImage(image2);
  if (image == (Image *) NULL)
    ThrowReaderException(CorruptImageError,"ImproperImageHeader")
  return(image);
}

Project: ImageMagick
File: mat.c

static Image *decompress_block(Image *orig, unsigned int *Size, ImageInfo *clone_info, ExceptionInfo *exception)
{

Image *image2;
void *cache_block, *decompress_block;
z_stream zip_info;
FILE *mat_file;
size_t magick_size;
size_t extent;
int file;

int status;
int zip_status;
ssize_t TotalSize = 0;

  if(clone_info==NULL) return NULL;
  if(clone_info->file)    /* Close file opened from previous transaction. */
  {
    fclose(clone_info->file);
    clone_info->file = NULL;
    (void) remove_utf8(clone_info->filename);
  }

  cache_block = AcquireQuantumMemory((size_t)(*Size < 16384) ? *Size: 16384,sizeof(unsigned char *));
  if(cache_block==NULL) return NULL;
  decompress_block = AcquireQuantumMemory((size_t)(4096),sizeof(unsigned char *));
  if(decompress_block==NULL)
  {
    RelinquishMagickMemory(cache_block);
    return NULL;
  }

  mat_file=0;
  file = AcquireUniqueFileResource(clone_info->filename);
  if (file != -1)
    mat_file = fdopen(file,"w");
  if(!mat_file)
  {
    RelinquishMagickMemory(cache_block);
    RelinquishMagickMemory(decompress_block);
    (void) LogMagickEvent(CoderEvent,GetMagickModule(),"Cannot create file stream for decompressed image");
    return NULL;
  }

  zip_info.zalloc=AcquireZIPMemory;
  zip_info.zfree=RelinquishZIPMemory;
  zip_info.opaque = (voidpf) NULL;
  zip_status = inflateInit(&zip_info);
  if (zip_status != Z_OK)
    {
      RelinquishMagickMemory(cache_block);
      RelinquishMagickMemory(decompress_block);
      (void) ThrowMagickException(exception,GetMagickModule(),CorruptImageError,
        "UnableToUncompressImage","`%s'",clone_info->filename);
      (void) fclose(mat_file);
      RelinquishUniqueFileResource(clone_info->filename);
      return NULL;
    }
  /* zip_info.next_out = 8*4;*/

  zip_info.avail_in = 0;
  zip_info.total_out = 0;
  while(*Size>0 && !EOFBlob(orig))
  {
    magick_size = ReadBlob(orig, (*Size < 16384) ? *Size : 16384, (unsigned char *) cache_block);
    if (magick_size == 0)
      break;
    zip_info.next_in = (Bytef *) cache_block;
    zip_info.avail_in = (uInt) magick_size;

    while(zip_info.avail_in>0)
    {
      zip_info.avail_out = 4096;
      zip_info.next_out = (Bytef *) decompress_block;
      zip_status = inflate(&zip_info,Z_NO_FLUSH);
      if ((zip_status != Z_OK) && (zip_status != Z_STREAM_END))
        break;
      extent=fwrite(decompress_block, 4096-zip_info.avail_out, 1, mat_file);
      (void) extent;
      TotalSize += 4096-zip_info.avail_out;

      if(zip_status == Z_STREAM_END) goto DblBreak;
    }
    if ((zip_status != Z_OK) && (zip_status != Z_STREAM_END))
      break;

    *Size -= (unsigned int) magick_size;
  }
DblBreak:

  inflateEnd(&zip_info);
  (void)fclose(mat_file);
  RelinquishMagickMemory(cache_block);
  RelinquishMagickMemory(decompress_block);
  *Size = TotalSize;

  if((clone_info->file=fopen(clone_info->filename,"rb"))==NULL) goto UnlinkFile;
  if( (image2 = AcquireImage(clone_info,exception))==NULL ) goto EraseFile;
  status = OpenBlob(clone_info,image2,ReadBinaryBlobMode,exception);
  if (status == MagickFalse)
  {
    DeleteImageFromList(&image2);
EraseFile:
    fclose(clone_info->file);
    clone_info->file = NULL;
UnlinkFile:
    RelinquishUniqueFileResource(clone_info->filename);
    return NULL;
  }

  return image2;
}